function testalert() {

	var msg = "你好";

	alert(msg);
}


function testNumber(){
	var i = parseInt("d238");//返回NaN
	var i2 = 400/0;//返回Infinity
	if(i==50)
		{
			alert(i);
		}else{
			alert(i2);
		}
	var n = parseInt("2asdf");
	alert(n);
	var x = 3;
	alert(x.toFixed(3));
	alert(x);
	x = x.toFixed(3);
	alert(x);
}

testNumber();
//alert(window.b);


var obj = new Object();

	obj.d = 48;


alert(obj.d);

alert(obj);


alert(obj.prototype);